本文件规定了评定建筑吸声产品吸声性能用的计权吸声系数的计算方法、结果表述以及吸声性能分级。本文件适用于按GB/T 20247测试,用吸声系数作为评价参数的所有建筑吸声产品。本文件不适用于按GB/T 20247测试,用吸声量作为评价参数的分立吸声体,例如座椅、空间吸声体等。本文件规定的计权吸声系数能适用于使用在工厂、办公空间、学校或医院等场所,以吸声降噪为目的的建筑吸声产品吸声性能评定或提出指标要求。但不适用于使用在会堂、音乐厅、剧场等场所,以控制音质为目的的建筑吸声产品吸声性能评定或提出指标要求,在这种情况下,只有给出随频率变化的完整吸声系数数据是合适的。
定价: 38元 / 折扣价: 33 元 加购物车
This standard specifies the deformation performance of curtain wall between stories,including the terms and definitions,grading,general provisions,test principles,apparatus,loading methods,mock-up and installation requirements,test procedure,test results and evaluation,and test report.
This standard is applicable to grading and project test.
定价: 252元 / 折扣价: 215 元 加购物车
This standard specifies the terms and definitions,graduations,test apparatus,test preparation,test procedure,result evaluation and test report of sand and dust resistance performance for building external windows and doors.
This standard is applicable to the graduations and laboratory tests of sand and dust resistance performance for building external windows and doors.The test objects are limited to the specimens of external windows and doors themselves,not involving the connecting parts between the external windows and doors and their openings.
定价: 456元 / 折扣价: 388 元 加购物车